一种新的混沌序列扩频水印算法  

A New Chaos-based Spread Spectrum Watermarking Algorithm

作　　者：王炎[1] 史谨璠[1] 王建军[1] 张立明[1] 

机构地区：[1]复旦大学电子工程系,上海200433

出　　处：《信息与电子工程》2004年第4期241-245,共5页information and electronic engineering

基　　金：国家自然科学基金(60171036;30370392)

摘　　要：提出了一种新的混沌序列扩频水印算法。该算法将混沌序列应用于水印嵌入算法的三个不同环节:水印密文的产生、子图像的选取以及DS-CDMA伪随机码的产生,使得混沌序列适用于噪声调制的统计特性得到充分应用。水印的提取利用了相关性检测。实验结果表明,该算法对于常用的信号处理攻击和几何变形攻击具有较高的鲁棒性。A new chaos-based spread spectrum watermarking algorithm is developed in the wavelet domain for still images. The algorithm makes full use of the properties of chaotic sequences in three ways: generating chaotic encrypted binary image watermarking signal, choosing subimage and generating DS-CDMA Pseudo-Random sequences. As usual, the watermark is detected by computing the correlation between the watermarked coefficients and the watermarking signals. Simulation results show that high fidelity and high robustness can be obtained under the attack of normal signal processing and geometric operations.

关 键 词：信息处理技术 扩频水印算法 混沌序列 小波域 

分 类 号：TP309[自动化与计算机技术—计算机系统结构]